Friction-clutch.



PATENTBD NOV. 6, 1906.

A. W. ROBINSON.' PRIGTION GLUTGH. APPLIOATIQNIILED APR. 20.*1906. f

A .wi/mman eo.

j To a/ZZ whom may concer-'11,: l

UNITED STATES PAT ENT orFioE ARTHUR W. RoBiNsoN, 'or MONTREAL, QUEBIfJdL CANADA.l y '.FRlCTlONLTCHp 'y l specication of Letters Patent. Y Applicata@ nea April 2o, 190e, serial No. 315415794. 1

Patenteirrov. o, 190e.

Be it known that l, 'ARTHUR W. ROBIN- soN, a citizen of the Dominion of Canada,

' in elevation. Fig. 2illustrates an end view lof that which is shown in Fig. 1.

anda resident ofthe city of Montreal, county of Hochelaga, Province of Quebec, Dominion l ure 1 illustrates a longitudinal vertical section of one form of theinventionas mounted upon a shaft. Part of the shaft is shown My invention, broadly stated, relates to l the means em 'loyed to convert motion along the axis-of a s aft linto rectilinear motion at right 'angles thereto-in other Words, radially -to a Wheel mounted thereon-l-for the purpose of operating'a frictionbelt in such manner 4that thepartsrequired to produce the end motion along the axis of the shaft-shall not occupy any extra space thereon, as'is ordinarily the case, and also in such mannerthat v 4the parts are extremely simple, inexpensive, and durable and embody a toggle connection whereby l obtain a great increment of power at the latter part of the clutch action or frictional hold, the advantage' of `Whichy is Well known. f 1 'j The general purposeof the resent invention is similar to that embodie in my Patent No. 465,536, dated December 2,2, 189i; but

the construction, arrangement, and method yof operation of the parts is essentially differ'.-

ent, and fromthesediiferences flow a series .gle -of the clutch.

of quite important advantages, which in certain'classesof mechanism are very-valuable. Y

Referring to the drawings, the construction and method of operation offthis present invention, asv illustrated in the form shown, are as follows:

. A represents the shaft upon which the enP tire apparatus is mounted. v

B is a flrum .running loosely on tlieshat.

C is the surfaceof the drum upon which` the frictionof the clutch is i plied. v

"D represents one of the' earings ,for the shaft.

E is a sliding'bar which vactuatesv the tog- It isarranged to slidey longitudinally througha hole made lin thel to the accompanying draw` The operation is obvious.

axis of the' shaft. F represents the extreme e forward endof this hole.

. l G'G are tWo lugs prcecting inwardly' from the rim of aspur-gear I is an arm or lever rigidly 'connected With a crossfshaft J, which has its bearin s in the lugs G G, and on the projecting en of this shaft there isa bellfcrank lever K., the ed of .Which-is pivotally connectedto a metalic strap or casting L, which is riveted 0.1*V bolted,

as by bolts M M, to the metallic strap N of the friction-clutch. This strap extends entirely around the spur-gear'andis attached at its other end to a centrally-located lug O', cast on'the rimI o f the. spur-gear, as shown. On

thelever I1 there is adownwardly-extending lug P, toy Which afs ring-bar Q is pivoted, 'which passesthroug an openingl made -in one. of thel s okes S ofthe spurear and is provided Wit a spring T, Which a uts at one end against a Washer U, confined by a nut, as shown, and at its other end abuts against the spoke S, als shown. l

- V 1s a radius-bar, the outer edge of which is \pivoted to the lever I, as shown, and the inner end slides in a slideivay W, cut inthe hub Y ofthe s ur-gear.'

Z i`st e toggle-arm,- the'ends of which are rounded, constituting semicircular heads or bearing-surfaces, which Work, respectively, in a correspondingly-shaped recess made in the sliding lbar E and in the radius-bar V. It Will be noted that the latter is supplied with a` downwardly-extending projection or lip a, so located as to `more effectively' sup ort the glefarm Z during ythe first' partof its operation;

The friction-belt N may he made in any referred form and supplied with any preihrredl friction` surfaces.- I show Wooden blocks b as the immediate Wearing-surfaces between the 'belt and the friction-surface C of the dru1n. i Y lc represents a collar'provided with a setscrew d, whereby it maybe fastened on the shaft A, so -as to prevent'end movement onv the partof the drum. This may, if preferred, vbe one ofthe bearings for the shaft A. j

it is desired to communicate the rotary moveradius-bar and take theend thrust o` the tog- ICBOv Assume that ment of the shaft A to the drum B, the bar E is b apparatus ordevice given endwis'e.y or lo itudinal movement through the hole in t e "Shaft A, in which it slides, and asit gradually moves inwardly the toggle-arm Z will, as is Well understood,'assume more and 'more a with the shaft wardlyl verticalposition, in so doing presenting upthe radiusf'bar V, which in lturn forces radial y the free end/of the lever I, rocking the shaft .J u on itabearings in the lu s G G. ThusthIQU'gli) theins'trumentality oft e bellycra'nkleve'r K closing strain is applied-u on the part'L and through it to theffrictiorr elt4 N, whereupon the-l'riction-suriaces'bb of the belt are drawn forcibly down u ori the friction-surface C ofthe drum, 'thusib contact compellinji-t to rotatecoincidently and it willv be. noted that the tog le-arm Z assumes more and more a vertica position, thus exerting greater and. greater force as' the resistancewof the vclutch increases, thus eifecting a smooth, l 'oweruL and sure clutch operation.

en-it is desired to release t e drum, the

tact'between the heads or bearing-surfaces of the toggle-arms Z and the seats in which they, respectively, Work, one in the sliding bar E, the otherI in the radius-.bar V.

It will be noted that the inner end of the radius-bar and the to gle-arm and sliding bar are all inclosed Within the shaft and within the recesses formed in the hub of the spur- Vear and in the shaft, so tliat'they cannot ecome misplaced and areiree from 'mj and distortion and also thatthe thrust oi the toggle-'arm upon the slid' lbar is received upon'its 'extended under sur ace, which bears circumferentially against the interior bore of the shaft, and that this pressure may be distributed throughout as extended a bearingsuriace as desired and that it is not interrupted or reduced by any :openings through the sliding bar E or in the shaft A. Consequently not only is the bearing-surface continuous, but it. is an easy matter to lubricate the same, and the lubrication remains for a lon time.

he simpl-icityand effectiveness of the invention is obvious. its embodiment as illustrated in the drawinvs is given as one exam'- le only and as a cesirable form in which 1t may beemployed and is a form employed by me in the construction of hoisting apparat'us.4 It is well adapted to dipper-d'redges and, in fact, to a large number of machines Where a clutch of this class is available.

yany suitable manual or mechanical y frictional-4 .device connected Wlt "eeaase ap aratus maybe ap lied on thc opposite -sidlig-oi the spur-gear, i desired, and it is not essential that the apparatus be supported upon a spur-gear. Any suitable equivalent-fas', for instance, a mere plate fast on the shaft A-will serve the same purpose, the ower'which effects the rotation of the shaft eing of' course suitably applied. Also iu place of the drum illustrated in the drawings as the part which is to be actuated. or controlled by the clutch any other part or eloment in a mechanical combination may obviouslybe substituted. Also l. have shown the shaft A as supported upon journals and adapted to rotation. Obviously the construe-- tion may besuch that the shaft will be staw tionary and act merely as a support `lor the parts-.that coact with it, the power being otherwise applied.

I-claim l 1. The combination of a shaft for the support ofthe device to be actuated or controlled,` said device itself, a bar adapted to longitudinal movement in the axis of the shaft, a suitably-sup orted lever, a clutch said lever, a 'togglef arm for actuating the lever the inner end whereof is supported upon the movable bar and means to move thebar. l2. The `combination oi` a shaft for the sup port ofthe device to be actuated or controlled, said device itself, a bar incloscd Within the shaft and adapted to longitudinal movement relative thereto, a suitalily-supported lever,A a. clutch device connected with said lever, a toggle-arm arranged to operato within the plane of the support vfor the lever, one end whereof passing through 'the shaft rests upon and is supported solely by the movable bar, the other end whereof' actuates said lever, and means to move the. bar.

3. The combination -of a suitably-supn ported rotary shaft, upon which the device to be actuated or controlledis loosely suported, said device itself, a bar :u apted to ongitudinal movement relative to the shaft, a gear keyed to the shaft, or bell-crunk lever pivoted thereto, a friction-clutch, one end whereof is fast to the gear, the other end lieing connected to the lever, a toggleurm, one

end whereof is supported upon the longitudinally-moving bar, the other Vend actuating said lever, and means to longitudinally move said bar.

4. The combination of a shalt for the sup-- 'port of the device to be actuated or controlled, said device itself a bar adapted to longitudinal movement relative to the shaft, a suitably-supported lever, a clutch device WOO connected with said lever, a to mle-arm, one

end whereof rests upon and is supported by the movable bar, means to move the bar and a spring to return the arts to primary position u on the release lo the' clutch.

5. he combination of a suitablv-sup- :3e

" "lfs'see'ae i:

. 'Eertedroteryshaft uponxz'whieh the device to e actueted or controlledisi loosely support-A ed, sa'id'f`deviee itself," a berinclosed within' the shaft end adapted izo-longitudinal move-` -Inentrelative to it,j'agear.keyed' to the sheft,

ebellfcrnk lever pivoted thereto-3; e friction-p 'clutchLfone end whereofis with seideer; the, other .end-being connected to .v ssidjjf everyA e-LtQggle-hrm; one end. whereof rests" upon endvs' supported by the ljo 'tudi-A nellyv-jmovingljer, fthe: other end w ereof y throughgsuiteble, 'devieesectuetes said lever, 5 seid'v lestfnemed devices.' and means to-move l said I l I l .15 e 6.1 '.Thej combinationfof -a'sheft for the; suparm',`one end whereof rests'upon and is supported by the movable bar, the other end eng with said radius-bar.

i 7. he combination of a. shaft for the support of the device to be actuated or controlled, said device itself; e bei' 'adapted to movement relative to the shaft,l means to -lnove said bar, e suitabl -sup orted lever, a. suitably-sup orted ra iuser connected with one emiofy seid lever, a clutch device also connected withseidy level?, a, t0gglea.rm, one end whereof engages with the movablebar, the other end-engaging with seid redius- 35 het, and s. spring to `return the artsto primary position upon the release o the clutch.

In testimony 'whereof I have signed my name to this specification in the presence of twosubfscrib" Lwitnesses. Y

Y', THUR W. ROBINSON.

i 'Witleswsegm i A. W l S'rEvENs'QN, 

